--- a/jdk/src/share/classes/com/sun/java/swing/plaf/windows/WindowsRootPaneUI.java	Fri Nov 02 15:57:20 2012 +0400
+++ b/jdk/src/share/classes/com/sun/java/swing/plaf/windows/WindowsRootPaneUI.java	Fri Nov 02 16:14:14 2012 +0400
@@ -31,6 +31,8 @@
 import java.awt.KeyEventPostProcessor;
 import java.awt.Window;
 import java.awt.Toolkit;
+
+import sun.awt.AWTAccessor;
 import sun.awt.SunToolkit;
 
 import java.awt.event.ActionEvent;
@@ -133,10 +135,15 @@
                 // window. If this time appears to be greater than the altRelease
                 // event time the event is skipped to avoid unexpected menu
                 // activation. See 7121442.
+                // Also we must ensure that original source of key event belongs
+                // to the same window object as winAncestor. See 8001633.
                 boolean skip = false;
                 Toolkit tk = Toolkit.getDefaultToolkit();
                 if (tk instanceof SunToolkit) {
-                    skip = ev.getWhen() <= ((SunToolkit)tk).getWindowDeactivationTime(winAncestor);
+                    Component originalSource = AWTAccessor.getKeyEventAccessor()
+                            .getOriginalSource(ev);
+                    skip = SunToolkit.getContainingWindow(originalSource) != winAncestor ||
+                            ev.getWhen() <= ((SunToolkit) tk).getWindowDeactivationTime(winAncestor);
                 }
 
                 if (menu != null && !skip) {

--- a/jdk/src/share/classes/java/awt/event/KeyEvent.java	Fri Nov 02 15:57:20 2012 +0400
+++ b/jdk/src/share/classes/java/awt/event/KeyEvent.java	Fri Nov 02 16:14:14 2012 +0400
@@ -930,6 +930,10 @@
                                                long extendedKeyCode) {
                     ev.extendedKeyCode = extendedKeyCode;
                 }
+
+                public Component getOriginalSource( KeyEvent ev ) {
+                    return ev.originalSource;
+                }
             });
     }
 
@@ -939,6 +943,14 @@
      */
     private static native void initIDs();
 
+    /**
+     * The original event source.
+     *
+     * Event source can be changed during processing, but in some cases
+     * we need to be able to obtain original source.
+     */
+    private Component originalSource;
+
     private KeyEvent(Component source, int id, long when, int modifiers,
                     int keyCode, char keyChar, int keyLocation, boolean isProxyActive) {
         this(source, id, when, modifiers, keyCode, keyChar, keyLocation);
@@ -1023,6 +1035,7 @@
         } else if ((getModifiers() == 0) && (getModifiersEx() != 0)) {
             setOldModifiers();
         }
+        originalSource = source;
     }
 
     /**

--- a/jdk/src/share/classes/sun/awt/AWTAccessor.java	Fri Nov 02 15:57:20 2012 +0400
+++ b/jdk/src/share/classes/sun/awt/AWTAccessor.java	Fri Nov 02 16:14:14 2012 +0400
@@ -629,6 +629,11 @@
          * Sets extendedKeyCode field for KeyEvent
          */
         void setExtendedKeyCode(KeyEvent ev, long extendedKeyCode);
+
+        /**
+         * Gets original source for KeyEvent
+         */
+        Component getOriginalSource(KeyEvent ev);
     }
 
     /**

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/javax/swing/plaf/windows/WindowsRootPaneUI/WrongAltProcessing/WrongAltProcessing.java	Fri Nov 02 16:14:14 2012 +0400
@@ -0,0 +1,169 @@
+/*
+ * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/* @test
+   @bug 8001633
+   @summary Wrong alt processing during switching between windows
+   @author mikhail.cherkasov@oracle.com
+   @run main WrongAltProcessing
+*/
+
+import sun.awt.SunToolkit;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.*;
+
+
+public class WrongAltProcessing {
+
+    private static Robot robot;
+    private static JFrame firstFrame;
+    private static JFrame secondFrame;
+    private static JTextField mainFrameTf1;
+    private static JTextField mainFrameTf2;
+    private static JTextField secondFrameTf;
+
+    public static void main(String[] args) throws AWTException {
+        try {
+            UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
+        } catch (Exception e) {
+            return;// miss unsupported platforms.
+        }
+        createWindows();
+        initRobot();
+        runScript();
+        verify();
+    }
+
+    private static void verify() {
+        Component c = DefaultKeyboardFocusManager
+                .getCurrentKeyboardFocusManager().getFocusOwner();
+        if (!(c == mainFrameTf2)) {
+            throw new RuntimeException("Wrong focus owner.");
+        }
+    }
+
+    public static void sync() {
+        SunToolkit toolkit = (SunToolkit) Toolkit.getDefaultToolkit();
+        toolkit.realSync();
+    }
+
+    public static void initRobot() throws AWTException {
+        robot = new Robot();
+        robot.setAutoDelay(100);
+    }
+
+    private static void clickWindowsTitle(JFrame frame) {
+        Point point = frame.getLocationOnScreen();
+        robot.mouseMove(point.x + (frame.getWidth() / 2), point.y + 5);
+        robot.mousePress(InputEvent.BUTTON1_MASK);
+        robot.mouseRelease(InputEvent.BUTTON1_MASK);
+    }
+
+    public static void runScript() {
+        robot.delay(1000);
+        printABCD();
+        pressTab();
+        clickWindowsTitle(secondFrame);
+        robot.delay(500);
+        robot.keyPress(KeyEvent.VK_ALT);
+        robot.keyRelease(KeyEvent.VK_ALT);
+        clickWindowsTitle(firstFrame);
+        sync();
+    }
+
+    private static void pressTab() {
+        robot.keyPress(KeyEvent.VK_TAB);
+        robot.keyRelease(KeyEvent.VK_TAB);
+    }
+
+    private static void printABCD() {
+        robot.keyPress(KeyEvent.VK_A);
+        robot.keyRelease(KeyEvent.VK_A);
+        robot.keyPress(KeyEvent.VK_B);
+        robot.keyRelease(KeyEvent.VK_B);
+        robot.keyPress(KeyEvent.VK_C);
+        robot.keyRelease(KeyEvent.VK_C);
+        robot.keyPress(KeyEvent.VK_D);
+        robot.keyRelease(KeyEvent.VK_D);
+    }
+
+    public static void createWindows() {
+        firstFrame = new JFrame("Frame");
+        firstFrame.setLayout(new FlowLayout());
+
+        JMenuBar bar = new JMenuBar();
+        JMenu menu = new JMenu("File");
+        JMenuItem item = new JMenuItem("Save");
+
+        mainFrameTf1 = new JTextField(10);
+        mainFrameTf2 = new JTextField(10);
+
+        mainFrameTf1.addKeyListener(new KeyAdapter() {
+            public void keyPressed(KeyEvent EVT) {
+                if (EVT.getKeyChar() >= 'a' && EVT.getKeyChar() <= 'z') {
+                    try {
+                        // imitate some long processing
+                        Thread.sleep(2000);
+                    } catch (InterruptedException e) {
+                        throw new RuntimeException(e);
+                    }
+                }
+            }
+        });
+
+        menu.add(item);
+        bar.add(menu);
+        firstFrame.setJMenuBar(bar);
+
+
+        firstFrame.add(mainFrameTf1);
+        firstFrame.add(mainFrameTf2);
+
+        firstFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+
+        firstFrame.pack();
+
+        secondFrame = new JFrame("Frame 2");
+        secondFrame.setLocation(0, 150);
+        secondFrameTf = new JTextField(20);
+        secondFrame.add(secondFrameTf);
+        secondFrame.pack();
+        SwingUtilities.invokeLater(new Runnable() {
+            @Override
+            public void run() {
+                secondFrame.setVisible(true);
+            }
+        });
+        SwingUtilities.invokeLater(new Runnable() {
+            @Override
+            public void run() {
+                firstFrame.setVisible(true);
+            }
+        });
+
+        mainFrameTf1.requestFocus();
+        sync();
+    }
+}